Automatic pencil-sharpener.



E. GRANTZOW.

AUTOMATIC FENGIL SHARPBNER.

APPLICATION FILED MAR.15, 1910.

1,0'75,971. Patented 001;. 14, 1913.

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EMIL GBANTZOV, OF DRESDEN, GERMANY.

AUTOMATIC PENCIL- SHARPENER.

Specification of Letters Patent.

Patented Oct. 14, 11%13.

Application filed March 15, 1910. Serial No. 549,552.

T 0 all whom, it may concern Be it known that I, EMIL GRANTZOW, acitizen of the German Empire, and resident of Dresden, Germany, haveinvented certain new and useful Improvements in AutomaticPencil-Sharpeners, of which the following is a specification.

This invention relates to a pencil holder for use in automatic pencilsharpeners, adapted to hold pencils of different thickness and to adevice in connection therewith, for adjusting the length of the pencilpoint.

The improvement may be used in connection with a pencil sharpener havinga rotatable knife and a step by step rotation of the pencil holder andconsists, primarily of two spring controlled slides, arranged one abovethe other in planes at right angles to the axis of the pencil holder,each slide having an opening of larger dimension than the thickness ofthe largest pencil intended to be sharpened, and arranged to aline orcoincide for the insertion of the pencil to be held therein.

The adjusting device for the length of the pencil point comprises aslide, movable in a plane located somewhat higher than the one on whichthe pencil point would normally rest, so that the pencil point is madecorrespondingly shorter.

The accompanying drawing illustrates in Figure 1 a front view of apencil sharpener, in Fig. 2 a vertical cross-section in a plane at rightangles to that of Fig. 1, and in Fig. 8 a plan view of Fig. 1. Fig. 4 isa vertical sectional view of the holder detached and showing thegripping devices in one position. Fig. 5 is a plan View thereof with thegripping devices in a similar position. Fig. 6 is a sectional viewsimilar to Fig. 4: with the grippers in a spread or open position. Fig.7 is a plan view similar to Fig. 5 with the grippers in the positionshown in Fig. 6.

The body portion a of the pencil sharpener carries the rotatable knife7), in a manner well known in the art. This body portion is providedwith the opening (Z through which the pencil extends into the cuttingplane. A toothed wheel 6 is arranged on the pencil holder 0 and adaptedto be rotated in the usual way of pencil sharpeners of this type, bysuitable devices on the rotatable cutter or its shaft. The pencil isinserted into the pencil holder, extends through the opening 0? into thecutting plane and rests normally in the recess f, forming the lowerextension of the opening cl.

The head of the pencil holder 0 carries in proper recesses, located atdiametrically opposite points of the head, two helical springs 9,arranged to act against flanges of the slides h, it. These slides arelocated one immediately above and, preferably, in contact with the otherand are movable in planes, substantially at right angles to the axis ofthe pencil holder, in guide ways, provided for this purpose in the headof the pencil holder. Each of the slides has a jaw i, the two jawsforming a clamp for holding, in a shear-like grip, the pencil insertedbetween the same. It will be seen that the slides h are capable ofholding a pencil as thin as the opening shown in Fig. 4 or as thick asthe one shown in Fig. 5.

The adjusting device for the pencil point consists of the slide is,movable in substantially a horizontal plane, located somewhat above therecess f of the 'opening d. A penoil, the advance of which is arrestedby striking this slide 70, receives obviously a point, proportionallyshorter than a pencil resting in the recess f.

lVhat I claim as new and desire to secure by Letters Patent of theUnited States is In combination with a pencil sharpening mechanism, of achuck rotatatively mounted in said mechanism and comprising a chuck bodyhaving a bore therein for insertion therethrough of a pencil, superposedgrippers disposed in overlapping relation with respect to each otherabove said body and each having an opening therein, the lower gripperhaving a downwardly projecting pencil engaging portion extending intoand adapted to engage a part of the bore of said body at one point andto arrest opening movement of said gripper, the upper gripper having apencil engaging portion for engaging the pencil in opposition to saidfirst named portion and projecting through the opening in said lowergripper and into the bore of said body to arrest opening movement ofsaid upper gripper, said upper gripper having an extension projecting inthe direction of the pencil closing movement of said gripper, a springinterposed between said extension and said chuck body whereby said uppergripper is actuated to move its pencil engaging portion toward theengaging portion of the lower gripper, the In testimony whereof I havehereunto lower gripper having an extension projectsigned my name this9th day of August ing in the direction of its movement in a 1909, in thepresence of two subscribing witdirection opposite to the extension ofsaid nesses. v 5 upper gripper, and a spring interposed between thechuck body and said lower gripper extension for moving the same and itsWitnesses: pencil engaging portion toward the pencil PAUL ARRAS,engaging portion of said upper gripper, O'r'ro BEAU EMSISTER. 10substantially as described.

EMIL GRANTZOW.

Copies-o1 this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washington, D. C.

